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Method for allowing temporary mechanical access to a multilateral junction through a landed and set upper completion and then re-sealing to allow commingled flow from the junction on final completion of the well.

Publishing Venue

The IP.com Prior Art Database

Abstract

Construction of multilateral junctions where segregated flow is required often results in a construction/completion methodology that removes the ability to access mechanically; one of the bores after the upper completion is installed. This document outlines a possible method that will allow the possibility to access either main or lateral bore through the installed/landed upper completion in the event that contingency intervention access is required, prior to the well being placed on production. Once the intervention has been performed the access will then be limited in order to allow individual well flow control from each branch.

Country

United States

Language

English (United States)

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Title:

Method for allowing temporary mechanical access to a multilateral junction through a landed and set upper completion and then re‐sealing to allow commingled flow from the junction on final completion of the well.

Abstract:

Construction of multilateral junctions where segregated flow is required often results in a construction/completion methodology that removes the ability to access mechanically; one of the bores after the upper completion is installed. This document outlines a possible method that will allow the possibility to access either main or lateral bore through the installed/landed upper completion in the event that contingency intervention access is required, prior to the well being placed on production. Once the intervention has been performed the access will then be limited in order to allow individual well flow control from each branch.

Introduction:

One of the problems facing multilateral wells is isolation of the previously constructed branch while drilling and completing the new lateral branch. In some applications this may not be a significant concern, as the fluid weight differential or pressure exerted on each branch may not be significantly different. However, depending on the reservoir completion and the specific application, the difference between the completion fluid in one branch and the drilling fluid required to drill the second branch, may dictate that a dedicated device is installed in the already completed branch to provide temporary isolation of one branch relative to the other. This isolation can be achieved using a variety of methods, typically using fluid loss control devices installed in the lower reservoir completion in each branch. The majority of the fluid loss control devices are activated by the application of direct pressure or pressure cycling to open these devices as the primary method, with mechanical shifting tools or similar as the contingency option to open these devices in the event of failure to open by the primary method. In many multilateral applications, through completion intervention access to either branch throughout the life of the well is not a requirement; through completion intervention access to the branch is a desirable feature prior to production start up, in the event that these devices require to be opened mechanically should pressure or other remote operation method fail to funct...